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Jerome D'Ambrosio's fight for second place in Formula E race in Mexico City with Sebastien Buemi was a fight for a win — courtesy of race-day winner Lucas Di Grassi and his disqualification after race.

Di Grassi's car was found to be under minimum prescribed weight, so Brazilian was excluded from results. The weight was 1.8 kilos below 888 kg minimum, and his Abt team can't find an explanation. "The car was weighed several times here in Mexico and exceeded the minimum weight every time," explains Hans-Jürgen Abt. "Because our team had not made any changes, we have no explanation for the measurement after the race."

Disqualification also means that Buemi still leads the championship, and Di Grassi is 22 adrift instead of leading.